1. Taxonomy of Helenium sect. Tetrodus and a conspectus of North American Helenium (Compositae)

   • Mark W. Bierner

   OriginalPaper Pages: 331 - 355

2. Evolutionary trends in the Central American species of Piper (Piperaceae)

   • William C. Burger

   OriginalPaper Pages: 356 - 362

3. A biosystematic study of the Interiores species group of the genus Vernonia (Compositae)

   • W. Zack Faust

   OriginalPaper Pages: 363 - 378

4. Chromosome numbers in North and Central American Compositae

   • Jerold L. Grashoff
   • Mark W. Bierner
   • David K. Northington

   OriginalPaper Pages: 379 - 394

5. Hedyotis correllii (Rubiaceae): A new Texas species

   • Walter H. Lewis

   OriginalPaper Pages: 395 - 397

6. Tres adiciones al genero Baccharis (Compositae) en Mexico

   • J. Rzedowski

   OriginalPaper Pages: 398 - 402

7. Free amino acids as taxonomic characters in the tribe Arundinelleae (Gramineae)

   • Venkata B. Reddi
   • James B. Phipps

   OriginalPaper Pages: 403 - 414

8. The taxonomic significance of the fatty acid content of seeds of Linum

   • C. M. Rogers

   OriginalPaper Pages: 415 - 419

9. A new Costa Rican species of Centropogon: C. irazuensis (Campanulaceae-Lobelioideae)

   • Robert L. Wilbur

   OriginalPaper Pages: 420 - 424

10. The sixth annual Jesse M. Greenman Award

    Notice Pages: 425 - 425